Wall Street's main stock indexes closed higher on Friday, with their biggest boost coming from Amazon's upbeat earnings forecast, but sentiment was dampened by worries that the Federal Reserve is... S&P 500 (SP500:): Stock quote, stock chart, quotes, analysis, advice, financials and news for Index S&P 500 | USA: SP500 | USA Get the latest S& P 500 (. INX ) value, historical performance, charts, and other financial information to help you make more informed trading and investment decisions.